![]() ![]() In the mechanical running test, the pump will run on the rated flow, so this 30% extra limit is not applied to the mechanical running test.įollowing FFT plot refers to the bearing housing vibration of centrifugal pump performance test in X, Y and Z axis Please note this only applies to performance test since the pump is tested in different flowrates. The API 610 requires out of preferred operating region the vibration level shall not be more than 30% of above-mentioned limits. The velocity vibration acceptance range for the overhung and between-bearing pump is provided in Table 8 and for vertically suspended pump addressed on table 9 of API 610.īased on the API 610 requirement the overall vibration for overhung pump shall be less than 3 mm/s (0.12 in/s) for overall frequency and 2 mm/s (0.08 in/s) for discrete frequency. If the accelerometer is used, then the software makes a calculation and changes that to the velocity. The bearing housing vibration is measured with velocity meter or accelerometer transducers (sensor). Depends on pump design, bearing housing vibration and shaft vibration are measured and plotted in the FFT (Fast Fourier Transform) spectrum at each data point from minimum to maximum flow to ensure the vibration values are within acceptance range. ![]()
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